Web winding mandrel



p 1967- E. D. NYSTRAND WEB WINDING MANDREL Filed April 25, 1966 v m. E w

INVENTOR. ERNST DANIEL NYSTRAND ATT'YS United States Patent 3,341,147 WEB WINDING MANDREL Ernst Daniel Nystrand, Green Bay, Wis., assignor to Paper Converting Machine Company, Inc., Green Bay, Wis., a corporation of Wisconsin Filed Apr. 25, 1966, Ser. No. 545,009 3 Claims. (Cl. 242-72) ABSTRACT OF THE DISCLOSURE A- mandrel body having a plurality of longitudinally extending recesses. Each recess receives a locking bar which is connected to the mandrel body by links and which is adapted for upward longitudinal pivotal movement with respect to the mandrel body to engage a core ensleeved on the mandrel body. The locking bars are maintained in the down or unlocked position by springs and may be urged upwardly by a screw threadedly received in one end of the mandrel body. The links are pivotally secured to the mandrel body by pins which are received in bores extending through the mandrel body.

This invention relates to a mandrel structure for use in web winding operations, and more particularly, to mandrel structure having a locking mechanism for holding a paper roll securely on the mandrel.

In web winding operations a core is first placed upon the mandrel of the web winding machine, and then locked into position on the mandrel. However, unless the core is locked uniformly along its longitudinal length, the core will ride unevenly on the mandrel and interfere with the accuracy of the winding of the web thereon. It is, therefore, an object of this invention to provide a mandrel structure having locking means which will securely hold the core on the mandrel. More particularly, it is an object of this invention to provide a mandrel structure having locking means which will securely hold a paper roll core on the mandrel by applying the locking force uniformly along the longtiudinal length of the paper roll core.

Other objects and advantages will be seen as the specification proceeds. The invention is explained in conjunction with the accompanying drawing, in which- FIG. 1 is an elevational view partly in section of the invention;

FIG. 2 is a cross-sectional view of the mandrel, taken along the line 22 of FIG. 1; and

FIG. 3 is .an end view such as would be seen from the line 33 of FIGURE 1.

Referring now to the drawings, and in particular to FIG. 1, the numeral generallly designates the mandrel body. The mandrel body 10 is used in conjunction with a mandrel assembly, which includes support means and rotating means (not shown) but which may be seen in my prior patent, United States Patent No. 2,901,192, issued Aug. 25, 1959.

The elongated mandrel body 10 is provided with a coreholding portion 10a and a concentric end portion 10b, having a radius smaller than the radius of the core-holding portion 10a. The core-holding portion 10a is provided with three longitudinally-extending recesses 11, in each of which a locking bar 12 is mounted. The core-holding portion 10a is also provided with the bores 13 extending through the portion 10a in a transverse plane (see FIG. 2).

Each locking bar 12 is pivotally connected to the links 14 by means of the pins 15, andthe links 14 are themselves pivotally connected to the mandrel body by means 3,341,147 Patented Sept. 12, 1967 of the pins 16. The pins 16 may be driven through the bores 13 (see FIG. 2) to secure the links 16 after the links 16 and the bars 12 are inserted within the recesses 11. The particular embodiment illustrated shows the mandrel body having three locking bars 12, but two oppositely opposed bars or even a single bar may also be used.

Mounted in the mandrel body are the springs 17, each of which biases its associated locking bar 12 toward the end portion 10b of the mandrel body 10. Mounted on the core-holding portion 10a of the mandrel body 10 on the end opposite the end adjacent to the end portion 10b is the stop 18.

Ensleeved on the end portion 10b of the mandrel body 10 in abutting relationship with the locking bars 12, is the collar 19. Also mounted on the end portion 10b of the mandrel body 10 and adjacent the collar 19 is the washer 20. The washer 20 is held in place by the Allen cap screw 21, which is threadedly engaged with the end portion 10b. The collar 19, the washer 20, and the screw 21 comprise urging means which act on the bars 12. If desired, the washer 20 may be eliminated and the screw 21 may act directly on the collar 19.

In operation, the core is received on the mandrel body 10, and the core is pushed securely against the stop 18. The screw 21 is then rotated, and the inward progression of the screw 21 forces the collar 19 against the locking bars 12.

As the screw 21 proceeds axially inwardly toward the stop 18, the force exerted by the collar 19 against the locking bars 12 overcomes the biasing action of the springs 17, and the locking bars 12 rotate longitudinally upwardly into locking engagement with the inner surface of the core. The locking bars 12 at all times remain parallel with the axis of the mandrel body 10, and it is seen that a uniform locking force is exerted along the entire length of the core. The core is thus locked securely on the mandrel body and the axis of the core is also maintained parallel to the axis of the mandrel body 10, thereby insuring that the paper will wind evenly from the parent paper roll onto the core. The longitudinal support provided by the bars constitutes an advantageous stabilizing means, which limits the natural tendency of the core to vibrate as it receives the web from the parent roll.

Although the invention has been described in conjunction with a mandrel used for winding paper, the invention may also be used with mandrels used in unwinding operations.

While in the foregoing specification a detailed embodiment of the invention was set forth for the purpose of illustration, it is to be understood that many of the details herein given may be varied considerably by those skilled in the art without varying the scope of the invention.

I claim:

1. In a mandrel structure adapted for use in web winding operations, an elongated mandrel body having a plurality of circumferentially spaced longitudinally extending recesses in its periphery, an elongated locking bar received in each of said recesses, a plurality of links, each of said locking bars being connected to said mandrel body by two of said links, one end of each of said links being pivotally secured to its associated locking bar and the other end being pivotally secured to the mandrel body for adapting said locking bars for pivotal movement longitudinally of the mandrel body, spring means on said mandrel body biasing said locking bars against pivotal movement, screw means on one end of said mandrel body for pivoting said locking bar longitudinally upwardly against said bias to engage the inner surface of a core ensleeved on said mandrel body.

3 4 2. The structure of claim 1 in which said mandrel body References Cited is provided with a bore therethrough associated with each UNITED STATES PATENTS of said links, each link being pivotally secured to said mandrel body by a pin received in the associated bore and 5401649 6/1895 E'flstwood 24 -72 X extending through the link, 5 1,479,253 1/ 4 Rlv fla 242-72 X 3. The structure of claim 1 in which said mandrel body i {1 31? d I d-d' t is provide wlth a reduce lame er portion at one end 24 7/1954 Lomazzo et a1 242 72 X thereof, a collar received on said reduced-diameter portion, said screw means being received on said one end and engaging said collar, whereby said collar may be moved 1 STANLEY GILREATH Pr'mary Examiner longitudinally on said mandrel body. 0 N. L. MINTZ, Examiner. 

1. IN A MANDREL STRUCTURE ADAPTED FOR USE IN WEB WINDING OPERATIONS, AN ELONGATED MANDREL BODY HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED LONGITUDINALLY EXTENDING RECESSES IN ITS PERIPHERY, AN ELONGATED LOCKING BAR RECEIVED IN EACH OF SAID RECESSES, A PLURALITY OF LINKS, EACH OF SAID LOCKING BARS BEING CONNECTED TO SAID MANDREL BODY BY TWO OF SAID LINKS, ONE END OF EACH OF SAID LINKS BEING PIVOTALLY SECURED TO ITS ASSOCIATED LOCKING BAR AND THE OTHER END BEING PIVOTALLY SECURED TO THE MANDREL BODY FOR ADAPTING SAID LOCKING BARS FOR PIVOTAL MOVEMENT LONGITUDINALLY OF THE MANDREL BODY, SPRING MEANS ON SAID MANDREL BODY BIASING SAID LOCKING BARS AGAINST PIVOTAL MOVEMENT, SCREW MEANS ON ONE END OF SAID MANDREL BODY FOR PIVOTING SAID LOCKING BAR LONGITUDINALLY UPWARDLY AGAINST SAID BIAS TO ENGAGE THE INNER SURFACE OF A CORE ENSLEEVED ON SAID MANDREL BODY. 